lots of work my friend lol
I do it all the time, having Dark & High Elves, Bretonnians, demons etc in my game as well as my custom races & traits lol

First make a mod folder within paradox's mod folder in documents

second, within your new mod folder, make a
Common Folder
GFX Folder
Interface Folder

third, find your Elder Scrolls and Warhammer mod, open them, goto culture folder, find, copy and paste the Khajit and Ork Culture text files into your mod's common folder where it should have it's own culture folder. With this, the race will appear in the race selection interface when starting a new game HOWEVER it will crash your game so don't try lol

fourth, goto the mods interface folder and find, copy and paste the files named such as,
portraits_orc_sprites.gfx
portraits_orc.gfx

into your mod's interface folder. These two mod files are essential for the mod to work.

fifth, goto the mod's GFX folder, go into character, and look for the Khajit and Ork folders. These contain the actual graphic's for the two races. Although I'm not sure, If the Khajit has both male and female folders, make to sure to copy both and paste them into your character folder within your mod's gfx folder.

That should be all you need. I haven't done it in awhile so don't kill me If it doesn't lol